SmogRank / World / Thailand / Bangkok / April 2025

Most unhealthy days in Bangkok, Thailand, April 2025

14 cities in Bangkok, Thailand ranked by their share of unhealthy days over the 30 days. The most unhealthy days: Bang Na, Thailand, 2 of 23 measured days. A city needs measurements on 70% of the days to be ranked.

Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.

← Bang Na 9% 8%0
Every city in Bangkok, Thailand ranked for April 2025, one column each, ranked by unhealthy days: height is the share of its measured days that were unhealthy, colour its average. Point at it to read a city; tap to open it.
  1. 1Bang Na
    2 of 23
  2. 2Nong Khaem
    2 of 23
  3. 3Khlong Sam Wa
    1 of 23
  4. 4Saphan Sung
    1 of 23
  5. 5Lat Krabang
    1 of 23
  6. 6Lak Si
    1 of 23
  7. 7Khan Na Yao
    1 of 23
  8. 8Bangkok
    1 of 23
  9. 8Ban Samae Dam
    1 of 23
  10. 10Bang Kapi
    1 of 23
  11. 11Sai Mai
    1 of 23
  12. 12Bueng Kum
    1 of 23
  13. 13Nong Chok
    0 of 23
  14. 14Ban Khlong Prawet
    0 of 23
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

All cities in the world, April 2025 · All cities in Thailand, April 2025 · Bangkok now

Use this board

SmogRank, most polluted cities in Bangkok, Thailand, by unhealthy days, PM2.5, April 2025, smogrank.com/th/region/bangkok/history/2025-04?by=days (accessed 7 Oct 2026).

Download top 10 by average (PNG)

You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.